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Unit 2 the impact of mining and oil extraction on the environment

Exercise 11. Read the text through and find the answers to these questions. Remember, you do not have to understand every word to answer the questions.

A.

1. How are pollutants generally treated? Name four different processes referred to in the text. – Scrubbing, filtration, absorption, adsorption.

2. What are the main causes of air pollution? – The internal combustion engine, industrial fuel combustion (especially utility power plants).

3. What is the usual way to control emissions of gas and particles into the atmosphere? – Emissions are usually limited to a specified weight per hour.

4. Which gas is mentioned as being particularly difficult to control? – Sulphur dioxide.

5. What industries are affected by regulations to control the emissions of this gas? – Copper smelting; coal-fired utility plants.

B. Read the text again carefully. While you read it, look for the answers to these questions.

1. Are these statements True or False?

- Environmental problems require the expertise of people with differing scientific backgrounds. – True.

- There are many devices on the market which can be used to solve all kinds of air and water problems. – False.

- Liquid wastes can be largely recycled after treatment. – True.

- Mining industry is no longer allowed to leave the land surface in a disturbed condition. – True.

- The highest proportion of atmospheric pollutants produced by man comprises carbon monoxides. – True.

- 30 % of air pollutants have natural causes. – False (20 % do).

- Regulations are concerned with emissions into the atmosphere of gases rather than solids. – False (particle emissions are controlled).

- Limestone slurries and caustic solutions are used to control sulphur oxide gas emissions. - True.

- Useful by-products can be obtained by treating gas streams from modern copper smelting operations. – True (the by-products are sulphur, liquid sulphur dioxide and sulphuric acid).

- New methods of producing copper by chemical means have been highly successful. – False (there have been many operational problems).